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Determination
of Methylene Chloride Extractable Matter (MCEM) from Selected Sources
at Primary Aluminum Production Facilities – USEPA Method 315 USEPA Method 315 is used for the simultaneous determination of PM and methylene chloride extractable matter (MCEM) when specified in an applicable regulation. Particulate matter and MCEM are withdrawn isokinetically from the source. PM is collected on a glass fiber filter maintained at a temperature in the range of l20 ± l4°C (248 ± 25°F) or such other temperature as specified by an applicable subpart of the standards or approved by the Administrator for a particular application. The PM mass, which includes any material that condenses on the probe and is subsequently removed in an acetone rinse or on the filter at or above the filtration temperature, is determined gravimetrically after removal of uncombined water. MCEM is then determined by adding a methylene chloride rinse of the probe and filter holder, extracting the condensable hydrocarbons collected in the impinger water, adding an acetone rinse followed by a methylene chloride rinse of the sampling train components after the filter and before the silica gel impinger, and determining residue gravimetrically after evaporating the solvents. |
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Last Update: October 25, 2006